JPS60124340A - Resistor built in cathode ray tube - Google Patents

Abstract

PURPOSE:To make it possible to keep changes in the value of a resistor within a small range even when used for a long period of time in the state of a high voltage being applied in a comparatively high temperature by specifying the composition of a resistive material to form resistor layer and also the composition of a material to form an insulated base plate. CONSTITUTION:An insulated base plate 18 is formed using aluminum oxide as a main constituent and a ceramic material containing calcium oxide, magnesium oxide, silicon oxide, etc. On this insulated base plate 18, a voltage-dividing resistor layer 19 is formed as follows: a resistive material in which a glass having a softening temperature of higher than 590 deg.C is mixed with resistant substances for example, an inorganic compound which contains ruthenium oxide, lead oxide, and silicon oxide as main constituents and, additionally, other materials such as aluminum oxide, titanium oxide, and titanium acid barium is melted and mixed up; when this resistive paste is calcined, the desired layer is formed. Furthermore, on the insulated base plate 18, an insulated coating 20 consisting of lead glass is formed to cover the voltage-dividing resistor layer 19.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a built-in resistor that is incorporated together with an electron gun in a tube such as a color cathode ray tube.

BACKGROUND ART AND PROBLEMS Conventionally, some color cathode ray tubes and the like used in color television receivers require high voltages to be supplied to convergence electrodes, focus electrodes, etc. in addition to the anode voltage. In such a case, it has been proposed to incorporate a voltage dividing resistor as a built-in resistor together with the electron gun in the tube, thereby dividing the anode voltage to obtain respective high voltages.

An example of a color cathode ray tube incorporating such a built-in resistor is shown in FIG. Reference numeral 1 designates a tube body, and an electron gun structure 2 is disposed within the neck portion a of the tube body 1, and this electron gun structure 2 has a first grid electrode G1 in common for three cathodes K. ．． Second grid electrode G2. Third grid electrode G3. A fourth grid electrode G4 and a fifth grid electrode G5 are sequentially arranged coaxially. A convergence means 3 is disposed downstream of the fifth Glysothoelectrode G5. Each grid electrode G1, G2
．． G3. G4 and G5 and the convergence means 3 maintain a predetermined positional relationship with each other, and the beading glass 4
The third grid electrode G
3 and the fifth grid-node electrode G5 are electrically connected by jn 1i15. Further, the convergence means 3 is electrically connected to the fifth grid electrode G5 via the conductive plate 6, and has inner deflection electrode plates 3a and 3b facing each other, and these inner deflection electrode plates 3a and 3b on the outside thereof.
It is formed with outer deflection electrode plates 3C and 3d disposed facing each other.

A built-in resistor 7 is set aside for such an electron gun structure 2, and a high-voltage electrode terminal 8 provided on this built-in resistor 7 is connected to the fifth grid nod electrode G5 through a conductive connection. ((
The convergence electrode terminal (hereinafter referred to as CV electrode terminal) 10 is electrically conductive.
A ground electrode is connected to the outer deflection electrode plates 3C and 3d of the convergence means 3 via the strip 11, and further has a ground electrode terminal 12 embedded in a stem 13 extending from the base of the neck portion 1a of the tube body 1. The conductive mounting is connected to the terminal pin 14 via a piece 15.

Further, a graphite conductive film 16 extending to the inner wall of the neck portion 1a is adhered to the inner wall of the funnel portion 1b of the tube body 1, and a high pressure supply button, that is, an anode button (not shown) provided on the funnel portion 1b The anode voltage is supplied through the A conductive spring 17 is provided on the conductive plate 6, and when the conductive spring 17 comes into contact with the graphite conductive film 16, the fifth grid electrode G5. Third grid electrode G3. The inner deflection electrode plates 3a and 3b of the convergence means 3 and the built-in (
An anode voltage is supplied to the high voltage electrode terminal 8 of the damping layer 7 .

Built-in resistor 7 built into such a color cathode ray tube
has the structure shown in FIGS. 2 and 3. FIG. 2 shows the built-in resistor 7 seen through from above the insulating coating forming the outer surface, and the third The figure is the second
3 shows a cross section of the built-in resistor 7 shown in the figure along line m-m. Conventional built-in resistor 7 shown in FIGS. 2 and 3
In 8., a terminal portion is formed by depositing an R electric layer on an insulating substrate 18 such as a ceramic plate, that is, a high voltage electrode terminal 8 to which an anode voltage is supplied. A CV electrode terminal 10 and a ground electrode terminal 12 from which a high voltage for a convergence electrode, that is, a convergence voltage can be obtained, are provided.
Between the V electrode terminal 10 and the earth electrode terminal 12 is a resistor layer 1 having a zigzag pattern having a predetermined resistance value.
Between the high voltage electrode terminal 8 and the CV electrode terminal 10, a resistor layer 19b having a combination of a zigzag pattern and a linear pattern is further provided between the high voltage electrode terminal 8 and the CV electrode terminal 10. Fine adjustment resistor layers 19C are respectively deposited between CV electrode terminals 19b and CV electrode terminals 10 to form voltage dividing resistor layers 19. In the shaded area in FIG. 2, an insulating liquid 1120 made of lead glass or the like is applied to cover the voltage dividing resistor layer 19. Note that by removing a portion of the fine adjustment resistor layer 19C during the manufacturing process of this built-in resistor 7, the resistance value of the resistor layers 19a and 19b between each terminal can be adjusted. It is set in.

When the built-in resistor 7 having such a configuration is installed together with the electron gun assembly 2 in the above-mentioned cathode ray tube, the anode voltage supplied to the high voltage electrode terminal 8 is applied to the CV electrode terminal 10 and the resistor layer A convergence voltage is obtained by dividing the voltage by 19a and 19b, and this convergence voltage is supplied to the outer deflection electrode plates 3C and 3d. Further, the earth electrode terminal 12 is grounded through the earth electrode terminal pin 14 of the tube body 1, and usually via an external variable resistor.

In such a built-in resistor 7, the CV electrode terminal 10 is connected to the outer deflection electrode plates 3C and 3d of the convergence means 3.
It is required to supply a constant convergence voltage to the tube body, and fine adjustment of this convergence voltage is performed by an external adjustment variable resistor inserted between the earth electrode terminal pin 14 of the tube body 1 and the earth. As the external variable resistor for adjustment, one with a narrow variable range is used for reasons such as improving accuracy and reducing power consumption. Therefore, in order to enable adjustment in a narrow variable range of the external variable resistor for adjustment, the built-in resistor layer 11 (resistance layer 1.98 and 19b forming the voltage dividing resistor layer 19)
In order to keep the respective resistance values as constant as possible, adjustment is performed using the above-mentioned fine adjustment resistor layer 19C.

However, the resistance value of the voltage dividing resistor layer 19 of the built-in resistor 7 changes depending on the voltage application time and temperature, especially under conditions where a high voltage is applied at a relatively high temperature. There is a possibility that the high temperature and high voltage act synergistically, and the resistance value change of the voltage dividing resistor layer 19 becomes large, making it impossible to obtain a predetermined convergence voltage at the CV electrode terminal 10. The temperature rise in the voltage dividing resistor layer 19 of the built-in resistor 7 is caused by Joule heat from the voltage dividing resistor layer 19 itself, that is, self-heating of the voltage dividing resistor layer 19. Due to the stray heat generated when the electrons generated by the discharge between the grid electrodes of the electron gun structure 2 or the continuous emission of electrons called stray collide with the partial voltage resistor layer 19. brought about.

As a measure to reduce such a change in the resistance value of the voltage dividing resistor layer 19 of the built-in resistor 7, it is possible to completely prevent the generation of electrons due to discharge or stray from the electron gun assembly 2, or to prevent the generation of electrons due to discharge or stray. Alternatively, it is possible to provide a shielding means for electrons due to strays, and furthermore, to increase the resistance value of the partial voltage resistor layer 19 in order to reduce Joule heat. increase the burden. This causes inconveniences such as complicating the structure and increasing costs.
It's not a good idea.

Purpose of the Invention In view of the above, the present invention provides a method for selecting the material of the voltage dividing resistor layer formed on the insulating substrate, and furthermore, the material of the insulating substrate on which the voltage dividing resistor layer is formed. As a result, even if the cathode ray is used for a long period of time under harsh conditions such as high pressure being applied at relatively high temperatures, the change in resistance value of the partial voltage resistor layer is extremely small. The purpose is to provide a built-in resistor for tubes.

Summary of the Invention The built-in resistor of a cathode ray tube according to the present invention has a plurality of electrode terminals disposed on five insulating plates made of ceramic whose i component is aluminium oxide J. A resistor layer formed of a resistor material obtained by mixing a resistor substance into glass having a softening point of 590 degrees Celsius or higher is disposed between the terminals, and the resistor layer is further coated. It is constructed by providing an insulating coating made of glass or the like.

Further, in an example of the built-in resistor of a cathode ray tube according to the present invention, the insulating substrate on which the above-described resistor layer is formed contains 0.01 to 0.1 weight percent of molybdenum oxide. be taken as a thing.

In this way, by selecting the composition of the resistance material forming the resistor layer and furthermore the composition of the material forming the insulating substrate, it is possible to maintain the resistance for a long period of time under relatively high temperature and high pressure conditions. Even when used, the change in the resistance value of the antibody layer can be kept within a small range.

Example Examples of the present invention will be described in detail below.

An example of the built-in resistor according to the present invention has the same configuration and external shape as the built-in resistor 7 shown in FIGS. 2 and 3, and in particular, a voltage dividing resistor layer 19 is formed on an insulating substrate 18 The glass in the resistive material is selected to have a softening point temperature of 12 or more than 590 degrees Celsius. That is, the built-in substrate 11 according to the present invention (an example of the anti-layer is the insulating substrate 18 as shown in FIGS. 2 and 3) contains aluminum oxide as a main component, and also contains calcium oxide, magnesium oxide, A high-voltage electrode terminal 8.C is formed of ceramic containing silicon oxide, etc., and is mounted on this insulating substrate 18.
A V electrode terminal 10 and a ground electrode terminal 12 are arranged, respectively.
Further, the resistor layer 19a between the CV electrode terminal IO and the earth electrode terminal 12, the resistor layer 19b between the high voltage electrode terminal 8 and the CV electrode terminal 10, and the both claw antibody layers 19a and 19b are connected to each other. The partial voltage resistor layer 19 consisting of the resistor layer 19c for fine adjustment is made of a resistor material made of glass having a softening point temperature of 590 degrees Celsius or higher mixed with a resistor substance, such as ruthenium oxide, lead oxide, and oxide. It is formed by firing a resistor paste obtained by melting and kneading an inorganic mixture containing silicon as a main component and, in addition, aluminum oxide), titanium Mide, barium titanate, etc. Further, an insulating film made of lead glass is provided on the insulating substrate 18 to cover the voltage dividing resistor layer 19.

The inventor of the present application has constructed a built-in resistor 7 having a configuration as shown in FIGS. (hereinafter referred to as the overall resistance value) target straightness of 600
MΩ, and prepared various types of glass with different softening point temperatures in the resistance materials used to form them, and used these to form two types of cathode ray tubes having the configuration shown in Figure 1. For cathode ray tubes A and B, a voltage of 30KV is applied between the high voltage electrode terminal 8 and the ground electrode terminal 12 of the built-in resistor 7.
From an experiment in which high voltage was applied to the partial voltage resistor layer 19 at a high temperature for a long period of time, the voltage was applied for 0 hours and for cathode ray tube B for 1680 hours. The relationship between the change ΔR in the overall resistance value of the partial voltage resistor layer 19 compared to the softening point temperature Ts of the glass in the resistance material is shown in FIG.
(percent/%), and the horizontal axis is Ts (temperature in degrees Celsius/'c
). ) The first experimental results were obtained as shown in (). In FIG. 4, the solid line curve shows the case of cathode ray tube A, and the broken line curve shows the case of cathode ray tube B. As is clear from the first experimental results, if the softening point temperature Ts of the glass in the resistive material is 590 degrees Celsius or higher, regardless of whether cathode ray tubes A or B are made of such resistive material, Change Δ in the overall resistance value of the voltage dividing resistor layer 19
R is kept within a very small range.

An example of the built-in resistor according to the present invention described above is based on the first experimental result, and has a softening point temperature of 5 degrees Celsius.
One voltage dividing resistor layer is formed of a resistor material made by mixing a resistor material into glass having a temperature of 90 degrees or more. Therefore, the built-in resistor having the voltage dividing resistor layer 19 has a small change in resistance value even if it is used for a long period of time under conditions where high voltage is applied at high temperature.

Next, in another example of the built-in resistor according to the present invention, the ceramic forming the insulating substrate 18 in the above-mentioned example does not contain 0.01 to 0.1 weight percent of molybdenum oxide. can be obtained. That is, in this example, there is also a high voltage electrode terminal 8. as in the above example. C
A V electrode terminal 10 and a ground electrode terminal 12 are arranged, respectively.
Furthermore, the insulating film Fi1B, in which the partial voltage resistor layer 19 is formed by firing a resistor material made by mixing a resistor substance into glass whose softening point temperature is 590 degrees Celsius or higher, is made of aluminum oxide as a main component. In addition to containing calcium oxide, magnesium oxide, silicon oxide, etc., it also contains o, oi to 0.1 weight percent of molybdenum oxide.

Apart from the above-mentioned experimental results, the inventor of the present application has discovered that a built-in resistor 7 having a configuration as shown in FIGS. 2 and 3
As such, the target value of the overall resistance value of the partial voltage resistor layer 19 is set to 600MΩ, and this is made of a resistor material in which a resistor material is mixed into glass having a softening point temperature of approximately 940 degrees Celsius. The insulating substrate 18 was formed on a ceramic insulating substrate 18 containing molybdenum oxide, and various insulating substrates 18 with different amounts of molybdenum oxide were prepared, as shown in FIG. Attached to two types of cathode ray tubes C and D having the configuration of
A voltage of 30 KV is applied between the high voltage electrode terminal 8 and the earth electrode terminal 12 of the built-in resistor 7, and this state is maintained at the cathode ray tube C.
3200 hours for Cathode Ray Tube, 168 hours for Cathode Ray Tube
From an experiment in which the voltage-dividing resistor layer 19 was left in a high-temperature state and high voltage applied for a long period of time, it was found that the voltage difference after voltage application state B compared to before the voltage application state Regarding the relationship between the change ΔR° in the overall resistance value of the piezoresistive layer 19 and the amount M of molybdenum oxide in the insulating substrate,
A second experimental result as shown in FIG. 5 (vertical axis is ΔR' (percent/%) and horizontal axis is M (heavy injection percentage/%)) was also obtained. In FIG. 5, the solid line curve shows the case of the cathode ray tube C, and the broken line curve shows the case of the cathode ray tube. As is clear from the results of this second experiment, the amount M of molybdenum oxide in the insulation board is 0.
．． In the range of 0.01 to 0.1 weight percent,
Regardless of whether the cathode ray tubes C or D are used, the change ΔR' in the overall resistance value of the voltage dividing resistor layer 19 formed on the insulating end plate is kept within an extremely small range.

Another example of the built-in resistor according to the present invention described above is the first built-in resistor described above.
In addition to the above experimental results, this is also based on the second experimental result, and is based on a partial voltage resistor layer made of a resistive material made of glass having a softening point temperature of 590 degrees Celsius or more mixed with a resistive material. 19 is an insulating substrate 18 made of ceramic containing 0.01 to 0.1 weight percent of molybdenum oxide.
It is formed on top. Therefore, even if the built-in resistor layer 19 is used for a long period of time under high temperature and high voltage conditions, the change in the resistance value of the voltage dividing resistor layer 19 can be suppressed to a smaller value than in the case of the above-mentioned example. Become.

Purpose of the Invention As is clear from the above description, in the built-in resistor of the cathode ray tube according to the present invention, the composition of the resistive material is selected to form a partial voltage resistor layer between each electrode provided on an insulating substrate. Furthermore, by selecting the composition of the ceramic forming the insulating substrate on the surface of which the voltage-dividing resistor layer is arranged, it is possible to Even if the device is used for a very long period of time under conditions where a high voltage is applied, the change in resistance value of the voltage dividing resistor layer can be kept extremely small.

Therefore, the built-in I■ of the built-in resistor of the cathode ray tube according to the present invention
(According to the anti-layer structure, it is possible to apply the required voltage to parts of the cathode ray tube that require a relatively high constant voltage, such as the convergence electrode, without complicating the structure or increasing the load on the electron gun structure.) It is possible to stably supply a constant voltage with almost no change over time.Also, it is possible to narrow the variable range of the external adjustment variable resistor placed outside the cathode ray tube. ,Thereby,
It is possible to improve the accuracy of the external variable resistor for adjustment and to further improve the power consumption.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram showing the main parts of a cathode ray tube in which a built-in resistor is incorporated, Fig. 2 is a plan view showing details of the built-in resistor incorporated in the cathode ray tube shown in Fig. 1, and Fig. 3 is a FIG. 2 is a sectional view taken along the line III-III in FIG. 2, FIG. 4 is a diagram showing the results of an experiment used to explain an example of the built-in resistor of the cathode ray tube according to the present invention, and FIG. 5 is a cross-sectional view of the cathode ray tube according to the present invention. FIG. 6 is a diagram showing other experimental results for explaining another example of the built-in resistor of FIG. In the figure, 2 is an electron gun structure, 7 is a built-in resistor, 8 is a high voltage electrode terminal, 10 is a convergence electrode terminal, 12 is a ground electrode terminal, 18 is an insulating substrate, 19 is a voltage dividing resistor layer, 1!
1a, 19b and 19C are a resistor layer and a fine adjustment resistor layer forming the voltage dividing resistor layer 19, respectively, and 20 is an insulating film. Figure 1 Figure 2 Figure 3 Figure 4 515 540 565 590 6+5 640
(-〒=-

Claims (2)

[Claims] (1) A plurality of electrode terminals on an insulating substrate made of ceramic whose main component is aluminum oxide, and a resistor material mixed into glass whose softening point temperature is 590 degrees Celsius or higher between the electrode terminals. A built-in resistor for a cathode ray tube, which is provided with a resistor layer made of a resistive material obtained by the above-mentioned method, and an insulating coating covering the resistor layer. (2) The built-in fl of the cathode ray tube according to claim 1, wherein the insulating shredded plate contains 0.01 to 0.1 weight percent of molybdenum oxide.